27
RS4100004 Rev. 0
Testing Procedures
!
WARNING
To avoid risk of electrical shock, personal injury, or death, disconnect electrical power source to unit and
discharge capacitor through a 10,000 ohm resistor before attempting to service, unless test procedures require
power to be connected. Ensure all ground wires are connected before certifying unit as repaired and/or
operational.
Restriction Testing
Restrictions in sealed system generally occur in capillary
tube or strainer, but can exist anywhere on liquid side of
system. To determine if a restriction exists:
1. Attach gauge and manifold between suction and
discharge sides of sealed system.
2. Turn unit on, and allow pressure on each side to
stabilize. Inspect condenser side of system. Tubing
on condenser should be warm and temperature
should be equal throughout (no sudden drops at any
point along tubing):
·
If temperature of condenser tubing is consistent
throughout, go to step 3.
·
If temperature of condenser tubing drops at any
point, tubing is restricted at point of temperature
drop (if restriction is severe, frost may form at point
of restriction and extend down in direction of
refrigerant flow in system). Go to step 4.
3. Turn unit off and time how long it takes high and low
pressure gauges to equalize:
·
If pressure equalization takes longer than 7
minutes, a restriction exists in the capillary tube/
strainer. Go to step 4.
·
If pressure equalization takes less than 7 minutes,
system is not restricted. Check for other possible
causes of malfunction.
4. Recover refrigerant in sealed system.
NOTE: Before opening any refrigeration system, capture
refrigerant in system for safe disposal.
5. Remove power from unit.
CAUTION
!
To reduce risk of personal injury or property
damage, take necessary precautions against high
temperatures required for brazing.
6. Remove and replace restricted device.
7. Evacuate sealed system.
8. Charge system to specification.
NOTE: Do not use captured or recycled refrigerant in
Amana units. Captured or recycled refrigerant
voids all Amana and/or compressor
manufacturer's warranties.
NOTE: Charge system with exact amount of refrigerant.
See Technical Sheet or refer to unit nameplate
for correct refrigerant charge. Inaccurately
charged system will cause future problems.
